among the first creatures appeared on Earth were a snail.There are a huge number of variations in shape, size, features, they are found in virtually every corner of the world, playing an important role in its ecosystem.
Surely every person at least sometimes wondered, what is the structure of snails?Do they have eyes, ears, teeth, brain?
structure of the cochlea can be considered an example of a giant class representatives Snails - Achatina, inhabitant of tropical African forests, to gain popularity as a pet.Easy maintenance, omnivorous, odorless, unpretentious and affectionate (each individual knows his master) - the factors due to which such a unique creature becomes a favorite in many homes.In captivity Achatina able to live about 10 years.
Structure snail Achatina Achatina
structure - the largest representative of the land molluscs is quite simple: head, trunk and sink, the size of which can reach 25 centimeters.
On his head is the mouth and tentacles - long and moving, his eyes at the end.The ability to see objects around Achatina measured at a distance of only 3 centimeters.Thus snails are very sensitive to light, especially to a bright intensity is perceived not only organs of vision, but also arranged on the body of the light-sensitive cells.
snail mouth equipped with teeth (about 25 thousand units), but not in all the usual sense.This device called "radula", which is fine, "grater" and adapted for grinding food.
ears, unfortunately, does not have a snail, so does not hear anything.Lack of hearing available to compensate mollusc olfactory organs: skin is the front part of the body and small caps, are located at the tips of the tentacles.The smell of chemical substances (alcohol, benzene, acetone), the snail is able to feel at a distance of 4 cm, the flavors of food feels in about 2 meters.The structure of the snails, due to the same tentacles and sole - bodies touch, gives them the ability to perceive the shape and texture of objects around, getting to know this way with the outside world.
pet -
Achatina Achatina snail structure, as well as the ability, in the apparent simplicity have interesting features.So, they are characterized by long-term memory: Achatina can remember placing food sources and to return to them.Adults have a permanent place to stay;when transferred to another place of snails (within 30 meters), it is crawling at his own, more familiar.Young specimens are characterized by mobility and can travel long distances during the day;also have the ability to further migration.
Features and snails
structure snails due to their terrestrial existence, and therefore the mollusks well developed sole, equipped with two leg glands that secrete mucus, and passed through a wave of cuts.These specific features are optimally cause slight movement of the snail on a dry surface.
Wrinkled skin on par with a light that is a snail in one instance, takes an important part in the breathing process.The internal structure of the cochlea is characterized by the presence of the heart, kidneys, nerves.According to experts, the snails are not able to feel pain.This strangeness is due to the absence of brain and spinal cord, instead of which there is a cluster of ganglia - the nerve nodes collectively form the nervous system of scattered-node type.
Protective functions
shell snail shell is durable and solid, performs the following functions:
- protects the soft body of a mechanical damage during transportation;
- protects against potential enemies;
- protects the snail body from drying out.
on the structure of the cochlea, or rather its shell, directly influenced by climatic conditions in which it lives.Thus, high humidity shell thin and transparent;in a dry and hot climate of its walls become thicker and the color becomes white (reflects sunlight and protects the snail from overheating).
Meet snail vine!
snail structure is no different from other types of devices: The same sink, torso and head with tentacles.Is the size, in contrast to the Achatina, an order of magnitude smaller.And the way of life close to the field, unlike the home Achatina.This endless fields, orchards and forests, where the most comfortable places for snails are damp moss, shade plants or stones, under which you can hide from the heat.
monochromatic painted shell snail spherical, has a rounded shape and protects the body of the mollusk from negative external factors.The leg with which the snail moves, big and muscular.
When traveling there is an allocation of mucus glands, softening the friction with the surface.The average speed of snail is 1.5 mm / sec.
How to breed snails?
avilable snails directly affects the process of reproduction in which each individual and acts as male and female.To do this, two snails are a love game, is to carefully feeling each other, and then merging the dense soles.In this way, shellfish exchange gametes.The eggs are covered with nutritious shell and having a supply of substances necessary for the development, snails lay in groups of 20-30 pieces in pits, which are then buried.After 2-3 weeks, there is the younger generation that is 1.5 months turns into a full-fledged adult snails.
